Remediating RDX-contaminated water and soil using zero-valent iron

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88 Scopus citations

Abstract

Soil and water contaminated with RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine) pose a serious threat to the environment and human health. Our objective was to determine the potential for using zero-valent iron (Fe0) to remediate RDX-contaminated water and soil. Mixing an aqueous solution of 32 mg RDX L-1 (spiked with 14C-labeled RDX) with 10 g Fe0 L-1 resulted in complete RDX destruction within 72 h. Nitroso derivatives of RDX accounted for approximately 26% of the RDX transformed during the first 24 h; these intermediates disappeared within 96 h and the remaining 14C products were water soluble and not strongly sorbed by iron surfaces. When RDX-contaminated soil (30 mg RDX kg-1 spiked with 14C-RDX) was treated with a single amendment of Fe0 (20 g kg-1 soil) in a static soil microcosm, more than 60% of the initial 14C-RDX was recovered as 14CO2 after 112 d. Treating surface and subsurface soils containing 3600 mg RDX kg-1 with 50 g Fe0 kg-1 at a constant soil water content (0.35-0.40 kg H2O kg-1 soil) resulted in a 52% reduction in extractable RDX following 12 mo of static incubation. A second Fe0 addition at 12 mo further reduced the initial extractable RDX by 71% after 15 mo. These results support the use of zero-valent iron for in situ remediation of RDX-contaminated soil.

Original languageEnglish (US)
Pages (from-to)1240-1245
Number of pages6
JournalJournal of Environmental Quality
Volume27
Issue number5
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

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